Antietam Iron Furnace Site and Antietam Village

Antietam is an unincorporated community and census-designated place in Washington County, Maryland, United States. Its population was 89 as of the 2010 census. It is the site of Antietam Iron Furnace Site and Antietam Village, added to the National Register of Historic Places in 1975.

Antietam Creek () is a 41.7-mile-long (67.1 km) tributary of the Potomac River located in south central Pennsylvania and western Maryland in the United States, a region known as the Hagerstown Valley. The creek became famous as a focal point of the Battle of Antietam during the American Civil War.

Hagerstown Valley is located in Maryland in the United States. It is part of the Great Appalachian Valley, which continues northward as Cumberland Valley in Pennsylvania, and southward as Shenandoah Valley in West Virginia and Virginia. Hagerstown Valley is bounded on the east by South Mountain, part of the Blue Ridge Mountains. On the west the valley is bounded by the Bear Pond Mountains — a range of mountains linking Blue Mountain and North Mountain. The valley is bounded on the south by the Potomac River and on the north by the drainage divide between Conococheague Creek, which flows south to the Potomac River, and Conodoguinet Creek, which flows northeast to the Susquehanna River. Sometimes the boundary between Hagerstown Valley and Cumberland Valley is defined politically, as the state line between Maryland and Pennsylvania. The political definition restricts Hagerstown Valley to Washington County, Maryland, while the larger definition includes part of Franklin County, Pennsylvania as well. Sometimes Cumberland Valley is defined so as to include Hagerstown Valley entirely, extending south all the way to the Potomac River. Antietam Creek flows through Hagerstown Valley to the Potomac River. Antietam National Battlefield is also in the valley, where the Battle of Antietam was fought during the American Civil War. The main cities are Hagerstown, Maryland and Waynesboro, Pennsylvania. The water divide between Hagerstown and Cumberland valleys occurs near the city of Chambersburg, Pennsylvania.

Wilson–Miller Farm is a historic home and farm located near Sharpsburg, Washington County, Maryland, United States. The house is a two-story, two-part, eight-bay log building resting on fieldstone foundations. The house features three brick chimneys, each painted red. Outbuildings include a one-story stone springhouse and a frame bank barn.It was listed on the National Register of Historic Places in 1980.

The Captain William Lucas and Robert Lucas House, also known as Linden Spring, is a large stone house near Shepherdstown in Jefferson County, West Virginia, United States. It was built circa 1783 for Captain William Lucas, a Revolutionary War soldier. Lucas' son, Robert Lucas was born here and became a Governor of Ohio and the first Territorial governor of Iowa. William Lucas was the son of Edward Lucas II, who arrived in Jefferson County in 1732 and received lands from Thomas Fairfax, 6th Lord Fairfax of Cameron. William's wife was Susannah Barnes, sister-in-law to James Rumsey, whose steamship experiments took place on the nearby Potomac River.

Burnside's Bridge is a landmark on the Civil War Antietam National Battlefield near Sharpsburg, northwestern Maryland.

The Battle of Shepherdstown, also known as the Battle of Boteler's Ford, took place September 19–20, 1862, at Boteler's Ford along the Potomac River, during the Maryland campaign of the American Civil War. After the Battle of Antietam on September 17, General Robert E. Lee and the Confederate Army of Northern Virginia withdrew across the Potomac. Lee left a rear guard commanded by Brigadier General William N. Pendleton at Boteler's Ford. On September 19, elements of the Union V Corps dueled with Pendleton's artillery before pushing a short distance across the river at dusk. Pendleton inaccurately informed Lee that all of the artillery of the rear guard had been captured. On the morning of September 20, the Confederates counterattacked with A. P. Hill's Light Division, forcing the Union units back across the Potomac. One Union unit, the 118th Pennsylvania Infantry Regiment, did not withdraw at the same time as the others and suffered heavy losses. Lee's army continued its retreat into the Shenandoah Valley after the battle.

Packhouse Ford, also known historically as Pack Horse Ford, Blackford's Ford and Boteler's Ford, is a historic crossing point of the Potomac River. It is located about 1 mile (1.6 km) east of downtown Shepherdstown, West Virginia, and south of Sharpsburg, Maryland, USA. The crossing was a Native American crossing site and eventually became a major crossing point in colonial times. During the American Civil War, it was used by military forces involved in the 1862 Battle of Antietam. The site of the ford is marked by a commemorative marker on the West Virginia side of the river, at the junction of River and Trough Roads.The ford was listed on the National Register of Historic Places in 2015.

The Potomac Mills was a mill complex located along the Potomac River roughly .5 miles (0.80 km) downriver of Shepherdstown. Built in 1826, the complex was originally used as a gristmill. In 1829, the mill began producing cement for the Chesapeake and Ohio Canal's construction. The factory continued to produce cement after the canal opened, and it shipped its product along the canal to other cities. Flooding and drought conditions in the 1880s led the mill to reduce its operations, and by 1901 the mill closed permanently.The remaining buildings from the mill occupy an 18-acre (7.3 ha) site and are mostly in ruins. The buildings include the main mill building, several lime kilns, a headrace wall, and an office building. The stone foundation of the mill's dam, which extends across the river into Washington County, Maryland, is also still part of the site. The mill site was added to the National Register of Historic Places on February 5, 2014.

Tolson's Chapel and School is a historic African American church located at Sharpsburg, Washington County, Maryland, United States. It was built in 1866 and served as a church and a Freedmen's Bureau school for black residents of Sharpsburg in the years following the American Civil War. It was listed on the National Register of Historic Places in 2008, and was designated a National Historic Landmark in 2021.

Mount Airy, also known as Grove Farm, is a historic home located at Sharpsburg, Washington County, Maryland, United States. It is a 2+1⁄2-story Flemish bond brick house, built about 1821 with elements of the Federal and Greek Revival styles. Also on the property are a probable 1820s one-story gable-roofed brick structure that has been extensively altered over time, a late-19th-century frame barn with metal roof ventilators, a 2-story frame tenant house built about 1900, and a mid-20th-century cinder block animal shed. It was used as a hospital for Confederate and Union soldiers following the Battle of Antietam. On October 3, 1862, President Abraham Lincoln and General George McClellan visited Mount Airy, an event recorded photographically by Alexander Gardner.It was listed on the National Register of Historic Places in 1986.

Dargan is an unincorporated community and census-designated place in Washington County, Maryland, United States. Its population was 165 as of the 2010 census.